2.0 Introduction Signal:something conveys information, represented mathematically as functions of one or more independent variables.Classified as: Continuous-time (analog)signals discrete-time signals,digital signals Signal-processing systems are classified along the same lines as signals: Continuous-time (analog)systems, discrete-time systems,digital systems 11 10/18/2022 Zhongguo Liu_Biomedical Engineering_Shandong Univ.11 10/18/2022 Zhongguo Liu_Biomedical Engineering_Shandong Univ. 2.0 Introduction ◆Signal: something conveys information, represented mathematically as functions of one or more independent variables. Classified as: ◆Continuous-time (analog) signals, discrete-time signals, digital signals ◆Signal-processing systems are classified along the same lines as signals: Continuous-time (analog) systems, discrete-time systems, digital systems